WinForm应用程序禁止多个进程允许

 

1. using System.Diagnostics;
2. using System.Runtime.InteropServices;
3. using System.Reflection;
4. [STAThread]
5. static void Main()
6. {
7. System.Diagnostics.Process instance = RunningInstance();
8. if (instance == null)
9. {
10. Application.EnableVisualStyles();
11. Application.SetCompatibleTextRenderingDefault(false);
12. Application.Run(new Form1());
13. }
14. else
15. {
16. HandleRunningInstance(instance);
17. }
18. }
19. /// <summary>
20. /// 获取当前正在运行的进程实例
21. /// </summary>
22. /// <returns></returns>
23. public static Process RunningInstance()
24. {
25. // 获取当前活动的进程
26. Process current = Process.GetCurrentProcess();
27. // 获取当前本地计算机上指定的进程名称的所有进程
28. Process[] processes = Process.GetProcessesByName(current.ProcessName);
29. foreach (Process process in processes)
30. {
31. // 忽略当前进程
32. if (process.Id != current.Id)
33. {
34. if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName)
35. {
36. return process;
37. }
38. }
39. }
40. // 如果没有其他同名进程存在,则返回 null
41. return null;
42. }
43. // 指示该属性化方法由非托管动态链接库 (DLL) 作为静态入口点公开
44. [DllImport("User32.dll")]
45. private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
46. [DllImport("User32.dll")]
47. private static extern bool SetForegroundWindow(IntPtr hWnd);
48. private const int WS_SHOWNORMAL = 3; //1:小窗体；2:最小化；3:最大化
49. /// <summary>
50. /// 如果有另一个同名进程启动,则调用之前的实例
51. /// </summary>
52. /// <param name="instance"></param>
53. private static void HandleRunningInstance(Process instance)
54. {
55. // 确保窗体不是最小化或者最大化
56. ShowWindowAsync(instance.MainWindowHandle, WS_SHOWNORMAL);
57. // 将之前启动的进程实例弄到前台窗口
58. SetForegroundWindow(instance.MainWindowHandle);
59. }